XM-15B Universal Bluetooth Serial Module – Arduino/HC-05/06 Compatible (3.3V/5V Dual Voltage)

SKU: FA2041
Bluetooth Version

V2.1 + EDR (Enhanced Data Rate)

Input Voltage (VCC)

3.0V – 6.0V DC

Logic Level (I/O)

Compatible with 3V / 3.3V / 5V TTL

Operating Current

4mA – 12mA (Pairing/Standby); ~12mA (Active Communication)

Default Settings

Baud: 9600; Pairing Code: 1234; Mode: Slave

Frequency Band

2.4GHz ISM Band

Transmit Power

+10dBm (Max)

Dimensions

37.5mm x 15.5mm x 4.0mm

Certification

Bluetooth BQB Certified

Product Description
The XM-15B Universal Bluetooth Serial Module is a high-performance, all-in-one wireless solution designed to bridge the gap between traditional serial communication and modern Bluetooth connectivity. Engineered as a superior alternative to standard HC-05 and HC-06 modules, the XM-15B features an integrated power management chip and level conversion circuitry. This allows for direct, “plug-and-play” compatibility with both 3.3V and 5V systems—including Arduino, Raspberry Pi, and industrial PLCs—without the need for external voltage dividers or logic level shifters.

Whether you are developing a single prototype or integrating wireless data transfer into a large-scale industrial fleet, the XM-15B offers a “Universal” architecture. It supports Master, Slave, and Loopback modes, switchable via simple AT commands, making it flexible enough for any network role. Its robust design includes a hardware watchdog and anti-reverse power protection, ensuring system stability in demanding environments.
Key Features
  • True 3.3V/5V Dual Compatibility: Built-in TTL signal level conversion allows seamless connection to 3V, 3.3V, or 5V microcontrollers.
  • Master/Slave Versatility: Unlike slave-only modules, the XM-15B can initiate connections (Master) or wait for them (Slave), functioning as a complete replacement for both HC-05 and HC-06.
  • Industrial-Grade Stability: Features an onboard hardware watchdog to prevent system crashes and a power management chip for stable operation between 3.0V and 6.0V.
  • High-Speed Initialization: Completes full module and protocol stack initialization in just 0.3 seconds.
  • Protection Circuitry: Integrated anti-reverse protection prevents module damage if the power supply is accidentally connected backward.
  • Extended Range: Delivers a maximum transmit power of +10dB, offering reliable communication up to 30 meters in open conditions (up to 60m theoretical).
Usage & Applications
  • Industrial Data Logging: Wireless reading of utility meters (gas/electric) and industrial field control systems.
  • Embedded Development: Seamlessly connects Arduino Uno, Mega, and Nano projects to Android smartphones or laptops.
  • Enterprise Procurement: A single-stock solution for businesses that previously required separate HC-05 and HC-06 inventories.
  • Remote Automation: Ideal for GPS navigation systems, robotic control, and wireless serial peripherals
Q: How does the XM-15B differ from standard HC-05 or HC-06 modules?

 The XM-15B is a “Universal” module. While the HC-06 is slave-only and the HC-05 often requires manual 5V-to-3.3V logic conversion, the XM-15B integrates these functions onboard. It can act as both Master and Slave and safely handles 5V logic signals natively.

Q: Is it safe to connect the TX/RX pins directly to an Arduino 5V pin?

Yes. The XM-15B includes a built-in level conversion circuit, making its I/O pins fully compatible with 5V logic. You do not need the external resistors typically required for older Bluetooth modules

Q: Can I pair two XM-15B modules together?

Yes. Since the module supports Master/Slave switching, you can configure one as a Master and the other as a Slave via AT commands to create a point-to-point wireless serial bridge

Q: What happens if I connect the power (VCC/GND) backward?

The module features anti-reverse protection. Unlike many hobbyist modules that would burn out instantly, the XM-15B is protected against accidental polarity reversal.

Q: How do I enter "Command Mode" to change the name or baud rate?

When the module is not connected to any device (indicated by a flashing LED), it is automatically in Command Mode. You can send standard AT commands via your serial monitor to adjust settings